SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3aef234bd3494cfc52b918315c039eef833a325a0c8ba846f9acb8cea79d7b' 
  AND token = 'umHdjzKCB6PGpsHx0ogkpZB60+zKmNjynFbuhdxfOq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}